I am having problems burning multiple copies of my DVD. I burned two copies that worked fine, and then the three that followed didn't work. I got the "formatting successful" message, but the discs wouln't play. I tried two different brands in two different players. I had this problem before, and someone mentioned that I should try clearing out the old files and re-formatting the disc. I can't find that option now on the toolbar. I thought there was an "advanced" tab where I did it last time, but now I can't find it. Any suggestions? I've already cleaned out all the unnecessary assets, and re-saved. Any other tips would be great! Thanks!